Messages in this thread | | | Subject | Re: [PATCH V2 0/3] Introduce Thermal Pressure | From | Thara Gopinath <> | Date | Tue, 30 Apr 2019 11:57:54 -0400 |
| |
On 04/29/2019 09:29 AM, Ionela Voinescu wrote: > Hi Thara, > >> >> Hackbench: (1 group , 30000 loops, 10 runs) >> Result Standard Deviation >> (Time Secs) (% of mean) >> >> No Thermal Pressure 10.21 7.99% >> >> Instantaneous thermal pressure 10.16 5.36% >> >> Thermal Pressure Averaging >> using PELT fmwk 9.88 3.94% >> >> Thermal Pressure Averaging >> non-PELT Algo. Decay : 500 ms 9.94 4.59% >> >> Thermal Pressure Averaging >> non-PELT Algo. Decay : 250 ms 7.52 5.42% >> >> Thermal Pressure Averaging >> non-PELT Algo. Decay : 125 ms 9.87 3.94% >> >> > > I'm trying your patches on my Hikey960 and I'm getting different results > than the ones here. > > I'm running with the step-wise governor, enabled only on the big cores. > The decay period is set to 250ms. > > The result for hackbench is: > > # ./hackbench -g 1 -l 30000 > Running in process mode with 1 groups using 40 file descriptors each (== 40 tasks) > Each sender will pass 30000 messages of 100 bytes > Time: 20.756 > > During the run I see the little cores running at maximum frequency > (1.84GHz) while the big cores run mostly at 1.8GHz, only sometimes capped > at 1.42GHz. There should not be any capacity inversion. > The temperature is kept around 75 degrees (73 to 77 degrees). > > I don't have any kind of active cooling (no fans on the board), only a > heatsink on the SoC. > > But as you see my results(~20s) are very far from the 7-10s in your > results. > > Do you see anything wrong with this process? Can you give me more > details on your setup that I can use to test on my board?
Hi Ionela,
I used the latest mainline kernel with sched/ tip merged in for my testing. My hikey960 did not have any fan or heat sink during testing. I disabled cpu cooling for little cores in the dts files. Also I have to warn you that I have managed to blow up my hikey960. So I no longer have a functional board for past two weeks or so.
I don't have my test scripts to send you, but I have some of the results files downloaded which I can send you in a separate email. I did run the test 10 rounds.
Also I think 20s is too much of variation for the test results. Like I mentioned in my previous emails I think the 7.52 is an anomaly but the results should be around the range of 8-9 s.
Regards Thara
> > Thank you, > Ionela. >
-- Regards Thara
| |